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Query for null values using PMQL

Hi all,

I would like to have a PMQL which looks for attributes with a null value, but unfortunately it looks like this isn't possible.

When looking in the PMQL documentation, it looks like there is a condition "IsNull" but it is mentioned in the section "Limitations" so I am afraid I'll have to read this as "unsupported". Is that correct?

Kind regards,

Peter